Touch DNA collection - Performance of four different swabs

Area of Science:

• Forensic Science
• Molecular Biology

Background:

• Effective DNA collection is crucial for forensic investigations.
• Evaluating new forensic tools is essential for improving evidence recovery.

Purpose of the Study:

• To compare the performance of four different DNA collection swabs.
• To assess DNA recovery and stability under controlled and quasi-operational conditions.

Main Methods:

• Controlled comparison of four swabs (Prionics, COPAN, Puritan, Sarstedt) for touch DNA collection from various items.
• DNA recovery quantification and statistical analysis.
• DNA stability testing over 12 months at room temperature.

Main Results:

• COPAN 4N6FLOQSwabs™ (Genetics variety) yielded significantly more DNA from collars and steering wheels than the reference swab.
• Puritan swab showed significantly lower performance on steering wheels.
• DNA remained stable on most swabs, except for COPAN Crime Scene variety, which showed degradation.

Conclusions:

• COPAN 4N6FLOQSwabs™ (Genetics variety) is a highly effective tool for touch DNA collection.
• The COPAN Genetics variety, with a desiccant, is recommended for further operational testing.
• Antimicrobial treatments on swabs may negatively impact DNA integrity.